Where can adolescent 11yo boy find out about relationships and growing up?

[Reddis]

Hi,
My DS is 11 going on 14! He's tall and hormonal and there's a lot of girlfriend/boyfriend activity his Y6 class. I'm constantly being told by other parents that 'it doesn't mean anything at that age' but I think it means EVERYTHING when you're that age!
Typically, he is acutely embarrassed by talk of girls and won't talk to me about any worries he might have. But it does at times make him very sad and down. (I know a little of what might be going on from keeping an eye on his phone use).
My question is - how do boys find out about relationships if they don't talk to anyone? Books, films and computer games he's interested in all seem to be about shooting, killing and crime whereas stuff aimed at girls seems much more relationship based.

So my question really, is, can anyone recommend any books etc that I can push his way that might be some substitute for being able to share his worries with anyone?

Thanks

Me and my 12 year old watch sitcoms together and I use it as a starting point to have conversations. I also know that school have covered some stuff so keep my ears open to what he has been learning about. Sometimes I even use a mumsnet thread as a discussion topic - grab it where you can :)

Recently got DS (10 yrs) let's talk about the birds and the bees by Molly Potter, it covers puberty etc but also good section on how relationships change, once he stopped giggling he obviously read it as it's prompted several conversations.